Reverting "Replace `lexical-let' with `cl-lexical-let'."
Revert "Replace `lexical-let' with `cl-lexical-let'."

This reverts commit 333a9e062e4c6b5bd00fa77510ed9fe6a46ca281.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>